No one likes sticky cams! I recently had a cam seize up on me, so I called metolius for advice and this is what they said:

Apply hot, soapy water and scrub between the lobes thouroughly with a toothbrush. Rinse REALLY well (get all the soap out), and then dry it REALLY well (it's ok to use a blow dryer). If whatever was blocking it up seems to be removed, then add a drop or two of cam lube or equivalent, and you should be good (that is, it worked for me).